CN115926631A - Aging-strengthening adhesive and application thereof in artificial board - Google Patents
Aging-strengthening adhesive and application thereof in artificial board Download PDFInfo
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- CN115926631A CN115926631A CN202211637818.5A CN202211637818A CN115926631A CN 115926631 A CN115926631 A CN 115926631A CN 202211637818 A CN202211637818 A CN 202211637818A CN 115926631 A CN115926631 A CN 115926631A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses an adhesive capable of being reinforced by aging and application thereof in an artificial board. The wood adhesive capable of being reinforced by aging is prepared from the following raw materials in parts by weight: 100 parts of active silicon-aluminum oxide, 1-220 parts of silicate, 1-50 parts of organic pre-curing agent and 0-10 parts of surface modifier. The adhesive has certain strength after being heated or cured at normal temperature, and is greatly improved along with the increase of time. The invention also provides an artificial board prepared by the adhesive, which is cured at normal temperature by adopting a process basically consistent with that of the traditional artificial board, and the water-resistant bonding strength is gradually enhanced. The adhesive disclosed by the invention has the advantages of environmental friendliness, wide raw materials, simplicity in synthesis, low cost and the like, and an artificial board prepared from the adhesive has the characteristics of high initial strength, good water resistance, flame retardance, low formaldehyde content, capability of aging strengthening and the like.
Description
Technical Field
The invention relates to an inorganic adhesive system, in particular to an adhesive system for preparing an artificial board, an artificial board prepared by using the same and a preparation method thereof.
Background
The new high-quality development stage of the transformation and upgrading of the artificial board industry in China puts more strict requirements on the aspects of flame retardance, water resistance, environmental protection, cost and the like of the artificial board. The national standard GB/T36900-2021 Classification of Formaldehyde emission from Artificial Board and products thereof divides the Formaldehyde emission limit of indoor Artificial Board and products thereof into E according to the limit value 1 、E 0 、E NF Three levels. Limit quantity mark E 1 Grade (0.124 mg/m) 3 ) Is a strict limit value of formaldehyde release in the interior decoration and finishing material artificial board and products thereof, and the original E 2 The limited number of levels has been eliminated, indicating that standards place higher demands on the environmental performance of the artificial board. The dominant position of reducing the consumption of harmful formaldehyde adhesives and the development of environment-friendly wood adhesives are greatly researched.
The geopolymer as alkali-activated cementing material is a new type of cementing material with alumino-silicate waste as main material and hydraulic property under the action of alkali, and is prepared by utilizing the catalytic principle of alkali activator (caustic alkali, alkali-containing silicate and aluminate). The material is considered to be a low-carbon cementing material due to low energy consumption and low emission in the preparation process and the capability of providing the performance similar to that of a cement-based cementing material. The geopolymer is used as an inorganic adhesive to be compounded with a wood material, so that the problem of formaldehyde pollution of the artificial board can be solved from the source, and the durability and the flame retardance of the artificial board can be effectively improved. However, the existing polymer has the defects of long curing time, low water-resistant bonding strength, high alkalinity and the like, and based on the application assumption of inorganic cementing materials in the artificial board industry, the invention provides an effective adhesive with low cost and capable of aging strengthening, a preparation method thereof and an artificial board prepared by using the adhesive, and the adhesive has good economic and ecological benefits.
Disclosure of Invention
The invention provides an adhesive capable of being reinforced in aging, a preparation method thereof and an artificial board prepared by using the adhesive, aiming at the defects of the prior art. By introducing the organic pre-curing agent, the geopolymer adhesive and wood form more effective glue nails in the gluing and curing process, so that the gluing strength is improved; by introducing the surface modifier, the geopolymer and the organic pre-curing agent are promoted to form an organic-inorganic cross-linked network structure, so that the strength and the water resistance of the colloid are improved; the aging strengthening of the prepared artificial board is realized through temperature and humidity adjustment and curing over time. The aging strengthening in the invention is as follows: with the increase of the maintenance time (day) of the artificial board, the water resistance and the bonding strength of the artificial board are continuously improved.
In order to achieve the purpose of the invention, the invention provides an adhesive capable of being reinforced by aging, a preparation method thereof and a plywood prepared by using the adhesive, and the technical scheme is as follows:
an adhesive capable of being strengthened by aging, a preparation method thereof and a plywood prepared by using the adhesive comprise the following steps:
the adhesive is prepared by mixing the following raw materials in parts by weight: 100 parts of active silicon-aluminum oxide, 1-220 parts of silicate, 1-50 parts of organic pre-curing agent and 0-5 parts of surface modifier, preferably 100 parts of active silicon-aluminum oxide, 5-30 parts of organic pre-curing agent and 1-2 parts of surface modifier;
the adhesive prepared by the preparation method is used for preparing the plywood by adopting a method comprising the following steps: 1) Gluing the wood veneer by using an adhesive; 2) Assembling the plate blanks layer by layer after gluing; 3) And carrying out hot press molding on the plate blank, and carrying out temperature and humidity adjustment maintenance with time to obtain the plywood capable of being strengthened by aging.
The active silicon-aluminum oxide is an active volcanic ash material, preferably 30 parts, and the silicate is prepared from 30-70 parts of sodium silicate solution, 0-20 parts of sodium hydroxide solution and 0-20 parts of potassium hydroxide solution; the active volcanic ash material is one or a mixture of more of metakaolin, fly ash, coal gangue, slag, calcined clay and rice husk ash plant ash, and is preferably metakaolin; the organic pre-curing agent is one or a mixture of more of urea-formaldehyde resin, phenolic resin, melamine-formaldehyde resin, acrylic resin, epoxy resin, tannic acid resin, lignin phenolic resin, resorcinol resin, protein glue and starch glue, and preferably is phenolic resin; the surface modifier is one or a mixture of a plurality of gamma-methacryloxypropyltrimethoxysilane, vinyltriethoxysilane and gamma-glycidoxypropyltrimethoxysilane, preferably gamma-methacryloxypropyltrimethoxysilane;
in particular, the metakaolin is prepared by high-temperature calcination of 50-1500 mesh kaolin; the calcination temperature is 400-900 ℃.
The modulus of the sodium silicate solution is 1-3.5, preferably 1.2-2.0; the concentration of the sodium hydroxide solution is 5-20mol/L, and preferably 8-12mol/L.
The organic pre-curing agent is powder or liquid; the solids content is 30-80%, preferably 40-50%; the pH value is 8-13, preferably 11-12.
The glue application amount of the single board is 150-500g/m 2 Preferably 250 to 400g/m 2 。
The wood veneer is poplar, eucalyptus, birch, fir, pine, basswood, elm or rubber wood.
The layer-by-layer assembling method is that after glue is applied, adjacent layers of veneers form a plurality of layers of cross structures or parallel structures to manufacture a plate blank.
The hot-press molding process is characterized in that the hot-press pressure is 0.5-3MPa, preferably 1-2MPa; the hot pressing temperature is 100-200 ℃, and the preferable temperature is 140-160 ℃; the hot pressing time is 0.3 to 3.0 minutes/mm, preferably 0.8 to 1.2 minutes/mm.
The curing conditions are that the temperature is 0-60 ℃, the relative humidity is 10-100%, and the curing time is 1-90 days.
The invention further provides the adhesive capable of strengthening the aging time and the plywood prepared by using the adhesive.
Compared with the prior art, the invention has the following advantages:
1. by introducing the organic pre-curing agent, the geopolymer adhesive and wood form more effective glue nails in the gluing and curing process, so that the gluing strength is improved;
2. the organic pre-curing agent is introduced to partially replace sodium silicate and sodium hydroxide solution used for alkali activation, so that the alkalinity of the geopolymer adhesive is reduced, the degradation effect of alkali liquor on wood is weakened, and the gluing and curing process is facilitated;
3. the invention introduces an organic pre-curing agent, constructs an organic-inorganic double-network structure through covalent bonds, hydrogen bonds and an inorganic aluminosilicate network, and improves the toughness and water resistance of a glue layer;
4. the surface modifier is introduced to promote the geopolymer and the organic pre-curing agent to form an organic-inorganic cross-linked network structure, so that the strength and the water resistance of the colloid are improved;
5. the invention effectively utilizes water vapor and low-concentration carbon dioxide in natural environment through temperature and humidity adjustment maintenance over time to promote continuous polymerization and carbonation of the glue layer and realize aging strengthening of the prepared artificial board.
Detailed Description
The invention is described in further detail in the following detailed description, and the advantages and features of the invention will become apparent as the description proceeds. These examples are illustrative only and do not limit the scope of the present invention in any way. Various modifications, combinations, or adaptations of the present invention may be made without departing from the spirit of the invention and these modifications, combinations, or adaptations are intended to be within the scope of the present invention as claimed.
Materials, equipments, instruments and the like used in the following examples are commercially available unless otherwise specified.
Comparative example 1
In order to verify the enhancement effect of the adhesive and the plywood prepared by using the adhesive, the plywood taking a pure geopolymer as the adhesive is prepared under the same hot pressing process condition, and the method comprises the following steps:
(1) Preparing an adhesive: respectively weighing 30g of metakaolin, 53g of sodium silicate solution with the modulus of 2.1 and 1g of sodium hydroxide solution with the modulus of 8mol/L, placing the metakaolin and the sodium silicate solution in a beaker, and uniformly mixing and stirring the metakaolin and the sodium hydroxide solution to obtain the geopolymer adhesive;
(2) Preparing a plywood: gluing poplar veneer by a roller gluing method, wherein the single-side gluing amount is 250g/m 2 The slab is made by 3 layers of crossing structures of adjacent layers of the single plates; hot-pressing and molding by adopting a hot-pressing process, wherein the hot-pressing pressure is 1MPa, the hot-pressing temperature is 150 ℃, and the hot-pressing time is 1 minute/millimeter.
(3) Curing over time: the prepared plywood is maintained for 1, 7 and 28 days under the maintenance conditions that the temperature is 25 ℃ and the relative humidity is 60 percent respectively.
The bonding strength and formaldehyde emission of the plywood test piece are tested according to GBT 17657-2013, namely physical and chemical property test method for artificial boards and decorative artificial boards, and the test results are shown in Table 1.
Comparative example 2
In order to verify the aging strengthening effect of the adhesive and the plywood prepared by using the adhesive, the plywood taking phenolic resin as the adhesive is prepared under the same hot pressing process condition, and the method comprises the following steps:
(1) Phenolic resin is used as an adhesive, a roller gluing method is adopted to glue the poplar veneer, and the single-side gluing amount is 180g/m 2 The slab is made by 3 layers of crossing structures of adjacent layers of the single plates; hot-pressing and molding by adopting a hot-pressing process, wherein the hot-pressing pressure is 1MPa, the hot-pressing temperature is 150 ℃, and the hot-pressing time is 1 minute/millimeter. Wherein the solid content of the phenolic resin is 42 percent, and the pH value is 12.
(2) Curing with time: and respectively curing the prepared plywood for 1, 7 and 28 days under the curing conditions that the temperature is 25 ℃ and the relative humidity is 60 percent.
The bonding strength and formaldehyde emission of the plywood test piece are tested according to GBT 17657-2013, namely physical and chemical property test method for artificial boards and decorative artificial boards, and the test results are shown in Table 1.
Example 1
An adhesive capable of being enhanced in aging and a plywood prepared by using the same comprise the following steps:
(1) Preparing an adhesive: respectively weighing 30g of metakaolin, 15g of phenolic resin, 38g of sodium silicate solution with the modulus of 2.1 and 1g of sodium hydroxide solution with the modulus of 8mol/L, placing the mixture in a beaker, and uniformly mixing and stirring the mixture to obtain the geopolymer adhesive; wherein the solid content of the phenolic resin is 42 percent, and the pH value is 12.
(2) Preparing a plywood: by means of rollersThe poplar veneer is glued by a cylinder gluing method, and the single-side gluing amount is 250g/m 2 The slab is made by 3 layers of crossing structures of adjacent layers of the single plates; hot-pressing and molding by adopting a hot-pressing process, wherein the hot-pressing pressure is 1MPa, the hot-pressing temperature is 150 ℃, and the hot-pressing time is 1 minute/millimeter.
(3) Curing with time: the prepared plywood is maintained for 1, 7 and 28 days under the maintenance conditions that the temperature is 25 ℃ and the relative humidity is 60 percent respectively.
The bonding strength and formaldehyde emission of the plywood test piece are tested according to GBT 17657-2013 (test method for physical and chemical properties of artificial boards and veneered artificial boards), and the test results are shown in Table 1.
Example 2
An adhesive capable of being enhanced in aging and a plywood prepared by using the same comprise the following steps:
(1) Preparing an adhesive: respectively weighing 30g of metakaolin, 15g of phenolic resin, 38g of sodium silicate solution with the modulus of 2.1 and 1g of sodium hydroxide solution with the modulus of 8mol/L, placing the mixture in a beaker, and uniformly mixing and stirring the mixture to obtain mixed slurry; 1.68g of gamma-methacryloxypropyl trimethoxy silane is dripped in and uniformly stirred to obtain the geopolymer adhesive; wherein the solid content of the phenolic resin is 42 percent, and the pH value is 12.
(2) Preparing a plywood: gluing the poplar veneer by adopting a roller gluing method, wherein the single-side gluing amount is 250g/m 2 The slab is made by 3 layers of crossing structures of adjacent layers of the single plates; hot-pressing and molding by adopting a hot-pressing process, wherein the hot-pressing pressure is 1MPa, the hot-pressing temperature is 150 ℃, and the hot-pressing time is 1 minute/millimeter.
(3) Curing over time: and respectively curing the prepared plywood for 1, 7 and 28 days under the curing conditions that the temperature is 25 ℃ and the relative humidity is 60 percent.
The bonding strength and formaldehyde emission of the plywood test piece are tested according to GBT 17657-2013 (test method for physical and chemical properties of artificial boards and veneered artificial boards), and the test results are shown in Table 1.
Example 3
An adhesive capable of being enhanced in aging and a plywood prepared by using the same comprise the following steps:
(1) Preparing an adhesive: respectively weighing 20g of metakaolin, 10g of fly ash, 15g of phenolic resin, 38g of sodium silicate solution with the modulus of 2.1 and 1g of sodium hydroxide solution with the modulus of 8mol/L, placing the mixture in a beaker, and uniformly mixing and stirring the mixture to obtain mixed slurry; dropwise adding 1.68g of gamma-methacryloxypropyltrimethoxysilane, and uniformly stirring to obtain the geopolymer adhesive; wherein the solid content of the phenolic resin is 42 percent, and the pH value is 12.
(2) Preparing a plywood: gluing the poplar veneer by adopting a roller gluing method, wherein the single-side gluing amount is 250g/m 2 The slab is made by 3 layers of crossing structures of adjacent layers of the single plates; hot-pressing and molding by adopting a hot-pressing process, wherein the hot-pressing pressure is 1MPa, the hot-pressing temperature is 150 ℃, and the hot-pressing time is 1 minute/millimeter.
(3) Curing over time: and respectively curing the prepared plywood for 1, 7 and 28 days under the curing conditions that the temperature is 25 ℃ and the relative humidity is 60 percent.
The bonding strength and formaldehyde emission of the plywood test piece are tested according to GBT 17657-2013, namely physical and chemical property test method for artificial boards and decorative artificial boards, and the test results are shown in Table 1.
Table 1 performance test results of the glued test pieces
The test result shows that:
compared with the pure geopolymer plywood in the comparison example 1, the test result of the example 1 shows that the organic pre-curing agent is doped to play a role in embedding the glue nails, more effective glue nails are formed with wood in the gluing process, and the gluing strength is greatly improved; the test result of the embodiment 2 shows that the surface modifier is doped to promote the geopolymer and the organic pre-curing agent to form an organic-inorganic cross-linked network structure, so that the strength and the water resistance of the colloid are improved, and the enhancement effect is more remarkable.
Compared with the pure phenolic resin plywood in the comparative example 2, the geopolymer adhesive and the plywood prepared by the geopolymer adhesive have the characteristic of being capable of being strengthened in an aging mode, and the formaldehyde emission of a plywood product is greatly reduced.
Claims (6)
1. A wood adhesive and artificial board thereof capable of aging strengthening are characterized in that:
the adhesive is prepared by mixing the following raw materials in parts by weight: 100 parts of active silicon-aluminum oxide, 1-220 parts of silicate, 1-50 parts of organic pre-curing agent and 0-5 parts of surface modifier; the active silicon-aluminum oxide is one or a mixture of more of metakaolin, fly ash, coal gangue, blast furnace slag, burnt clay, rice hull ash and plant ash; the silicate is one or a mixture of liquid sodium silicate, sodium hydroxide and potassium hydroxide; the organic pre-curing agent is one or a mixture of more of urea-formaldehyde resin, phenolic resin, melamine-formaldehyde resin, acrylic resin, epoxy resin, tannic acid resin, lignin phenolic resin, resorcinol resin, protein glue and starch glue; the surface modifier is one or a mixture of more of gamma-methacryloxypropyltrimethoxysilane, vinyl triethoxysilane and gamma-glycidoxypropyltrimethoxysilane;
the artificial board is prepared by the adhesive obtained by the preparation method through the following steps: 1) Gluing the wood veneer by using an adhesive; 2) Assembling the plate blanks layer by layer after gluing; 3) And (3) carrying out hot press molding on the plate blank, and carrying out temperature and humidity adjustment maintenance with time to obtain the plywood capable of being reinforced by time. The curing conditions are that the temperature is 0-60 ℃, the relative humidity is 10-100%, and the curing time is 1-90 days.
2. The method of claim 1, wherein the organic pre-cure agent is a powder or a liquid.
3. The method of claim 1, wherein the veneer sizing amount is 150-500g/m 2 。
4. The method of claim 1, wherein the wood veneer is poplar, eucalyptus, birch, fir, pine, basswood, elm, or rubber wood.
5. The method of claim 1, wherein the layer-by-layer assembly method is to form a slab by combining a plurality of layers of cross structures or parallel structures with adjacent layers of the sized veneers.
6. The method according to claim 1, wherein the hot press molding process comprises a hot press pressure of 0.5 to 3MPa, a hot press temperature of 100 to 200 ℃, and a hot press time of 0.3 to 3.0 min/mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211637818.5A CN115926631A (en) | 2022-12-16 | 2022-12-16 | Aging-strengthening adhesive and application thereof in artificial board |
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| CN202211637818.5A CN115926631A (en) | 2022-12-16 | 2022-12-16 | Aging-strengthening adhesive and application thereof in artificial board |
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